This colorful jellyfish is not one organism but a colony of four kinds of polyp. The stinging cells on the tentacles with which it fishes secrete a substance that is almost as toxic as cobra venom ...

The vast majority of jellyfish, whether dangerous or not, have a body that can be described as bulbous, bell-shaped, or balloon-like. They may vary tremendously in size and color, although most ...

Jellyfish fossils are hard to come by because their soft tissue doesn’t leave skeletal remains, but traces of them have been found in sediment from 500 million years ago. Froilan Robas ...